Hearthstone Questions

Okay, so my husband and I recently started playing this and so far I do have a few questions, if anyone with a bit of knowledge of this game could answer me, that would be awesome:

1) What is the rarity index on cards and the order it goes in. So far I have noticed Common, Rare, Epic.

2) What is the best hero to use or are certain heroes even stronger than others? Are some heroes stronger against specific other classes? I struggled to beat the Warlock in practice mode using both a Paladin and a Rogue but beat him easily using a Hunter.

3) Is there a way to view your cards by rarity instead of by which hero they can be used with or how many mana they require?

2. There is no best hero, they all have their different advantages which makes it quite fair. My favourite to use is a Warlock because of the life tap, but that can either be a blessing or a curse sometimes. Mage decks can be awesome too due to spells like flamestrike wiping out the board, and the mage's ability is amazing for taking out those X/1 monsters. The more you play around the more you'll get a feel for the different heroes and their decks.

3. I don't think you can sort by rarity but if you type in "epic" or "rare" then all the epic/rare cards will come up

I also learnt a lot from watching TotalBiscuit's videos, he usually does gimmick decks but for the lord of the arena thing that he does he explains why he chooses each card n shit.

2. There is no best hero, they all have their different advantages which makes it quite fair. My favourite to use is a Warlock because of the life tap, but that can either be a blessing or a curse sometimes. Mage decks can be awesome too due to spells like flamestrike wiping out the board, and the mage's ability is amazing for taking out those X/1 monsters. The more you play around the more you'll get a feel for the different heroes and their decks.

3. I don't think you can sort by rarity but if you type in "epic" or "rare" then all the epic/rare cards will come up

Yay! Thank you for the reply.
I have an epic but no Legendary's (yet *cackles*). I just started the day before yesterday though, I think.

I just started getting back into Hearthstone as well. We just got an iPad and I've been using that for it. However, I'll most likely be playing on the PC. I'll be sure to hit you guys up for help, no doubt I'll need some.